body {
    font-size: 18px;
    margin: 0;
    padding: 0;
    text-decoration: none;
}

li {
    list-style: none;
}

a {
    text-decoration: none;
}

img {
    max-width: 100%;
}

#id名字 {
    属性1: 属性值；
}

） .类名 {
    属性1: 属性值；
}

) 元素1 元素2 {
    样式
}

#top {
    padding: 20px 0;
    width: 100%;
    background-color: #222;
}

.topList {
    display: table;
    width: 100%;
    padding: 0;
}

.topList li {
    display: table-cell;
}

.topList li>a {
    display: block;
    text-align: center;
    color: white;
}

#content {
    width: 100%;
    margin: 10px 0 20px 0;
    overflow: hidden;
}

.left_side {
    float: left;
    width: 50%;
    margin-left: 1.2%;
}

.top_pic {
    padding: 10px 60px;
    background-color: #eee;
}
#products div{
    width: 30%;
    display: inline-block;
    padding: 0 10px;
}
#right_side{
	float: right;
	width: 28%;
	margin-right: 1.2%;
}
.list_group{
	margin-bottom: 30px;
}
.list_title{
	padding: 10px 15px;
	font-weight: bold;
	color: #fff;
	background: #337ab7;
}
.list_item{
	padding: 10px 15px;
	margin-bottom: -1px;
	border: 1px solid #ddd;
}
#bottom{
	position: relative;
	width: 100%;
	height: 30px;
}
#bottom a{
	position: absolute;
	right: 1.2%;
}
#bottom p{
	position: absolute;
	margin: 0;
	left: 1.2%;
	font-style: italic;
}